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How do you use exponents to write 7.5 million in expanded notation?
See: http://www.mathsisfun.com/definitions/expanded-notation.html
##(7xx1,000,000) + (5 xx 100,000)##
Writing the term "7.5 million" in standard notation is: 7,500,000
To start then this can be expanded to:
##7,000,000 + 500,000 ->##
##(7xx1,000,000) + (5 xx 100,000)##